
<<(+Number1, +Number2, -Result)
-Result is +Number1 << +Number2

   Shifts Number1 left by Number2 bits and unifies the
resulting value with Result.



Arguments
   Number1             Integer.
   Number2             Integer.
   Result              Output: integer.

Type
   Arithmetic

Description

   Shifts Number1 left by Number2 bits and unifies the resulting value
   with Result.

   The shift behaves as if operating on an unlimited length two's complement
   representation.  Shifting by a negative amount is the same as shifting by
   the same positive amount in the other direction.

   This predicate can be used as a function in arithmetic expressions.
   In coroutining mode, if Number1 or Number2 are uninstantiated, the call
   to <</3 is delayed until these variables are instantiated.




Modes and Determinism
   <<(+, +, -) is det

Exceptions
     4 --- Number1 or Number2 is not instantiated (non-coroutining mode    only).
     5 --- Number1 or Number2 is a number but not an integer.
    24 --- Number1 or Number2 is not of a numeric type.

Examples
   
Success:
    Result is 1 << 3.		% gives Result = 8
    Result is 5 << 1.		% gives Result = 10

    Result is 10 << -1.		% gives Result = 5

    Result is -5 << 1.		% gives Result = -10

Error:
    Result is 1.1 << 3.		% type error


See Also
   is / 2
